third_party/linux: enable landlock at boot time

Required by a customer workload. Also likely to be
used by our own OS components in the future.

Change-Id: I7ddb2fadba483fd3c4aabecdce45c37679fca6c9
Reviewed-on: https://review.monogon.dev/c/monogon/+/3296
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/third_party/linux/linux-metropolis.config b/third_party/linux/linux-metropolis.config
index 578e955..4888f05 100644
--- a/third_party/linux/linux-metropolis.config
+++ b/third_party/linux/linux-metropolis.config
@@ -4146,7 +4146,7 @@
 CONFIG_EVM_ATTR_FSUUID=y
 # CONFIG_EVM_ADD_XATTRS is not set
 CONFIG_DEFAULT_SECURITY_DAC=y
-CONFIG_LSM="lockdown,yama,loadpin,safesetid,integrity"
+CONFIG_LSM="landlock,lockdown,yama,loadpin,safesetid,integrity"
 
 #
 # Kernel hardening options